Update RTD

.readthedocs.yaml

@@ -30,6 +30,6 @@ sphinx:
 # Optional but recommended, declare the Python requirements required
 # to build your documentation
 # See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
-# python:
-#    install:
-#    - requirements: docs/requirements.txt
\ No newline at end of file
+python:
+  install:
+  - requirements: docs/requirements.txt
\ No newline at end of file

docs/requirements.txt

+sphinx_rtd_theme
\ No newline at end of file